Talk:Phosphate rich organic manure

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References

150 million tones of high grade rock phosphate mineral is mined every year is from: [1] Engineering and Mining Journal, Vol. 201, No. 3, March, 2000.

Fixation of P by soil cations known as phosphate problem is from: [2]The Nature and Properties of Soil,Collier Mac Millan, London,1984.

Organic matter [say farm yard manure] can complex metal ions is from: [3] primary vegetative growth on an old tailings dam - Zawar Mines, Minerals and Environment, Vol.5, London, 1983. Those who knew editing may please incorporate these references in the article. (4) It is an important factor for plant growth. Sam.